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How The NEW JERSEY worksHistory of safety barriers

A safe road is the one that does not have pitfalls and that, in addition also allows you to make mistakes because if you exceed in carelessness or improper behavior, "something" will help. These are the two concepts of ACTIVE and PASSIVE road safety.
ACTIVE safety is what makes an accident less probable; PASSIVE safety is that which reduces the consequences of an accident occured.
In this second context, enters wall barriers.
Passive road safety devices, whatever their function (median strip or road border) can be designed and manufactured with different materials and techniques of operation. They are distinguished, in fact, barriers to blades and stakes (steel, also called guard rail) that reduce the energy of the impact with the deformation of the steel and wall barriers, (precast concrete and simply positioned) that control the collision with the redirective shape and the displacement of the artifact. In Italy, unlike many other European countries, we see a massive use of steel guard rails, unfortunately, always higher and more dangerous, while complying with Italian laws.
The fault lies in the fact that not all barriers, even those complying with regulatory requirements, offer the same potential safety, because the rules have been amended several times, imposing safety requirements impractical and potentially dangerous, and because they often design barriers to overcome tests, and not to control the outcomes of actual accidents.

From 1 January 2011, EN 1317 part 1,2,3,4,5 will also refer to biomechanical indicators for test controls, and will not privilege the effects of impacts on vehicles but rather accidental injury . Since 2005, ABESCA barriers, are all tested using instrumented anthropomorphic dummies, that verifies as in tests used for passenger cars, the validity of the protection of man (measured bio-mechanics). Concrete wall barriers are now much more reliable and above all safer, when compared to those of blades and stakes in steel (guard rail). In the event of an impact against the latter, in cases of medium or light impacts, the intrusion of the blade in the passenger compartment can occur or for the higher barriers, the collision between the blade of the barrier and the passenger's head; in cases of stronge impact, such as the ones involving heavy vehicles, one can verify the uprooting of the stakes and then the collapse of the barrier.


Not to mention the effects on motorcyclists. The concrete barrier (in its various forms) in the event of a collision and thanks to its particular profile, generates a dynamic return effect of the car towards the roadway that the vehicle is travelling on.
Furthermore, the displacement of the barrier makes the impact plastic, favoring a better control of the trajectory of the vehicle which flows along the barrier, without crossing the current traffic. The advantages of concrete barriers are not only limited to impact cases. Their shape and their small dimensions in the upper part, also favor a better visibility in curves for the driver when overtaking, in comparision to steel guardrails which are always high and wide at the top. Furthermore, the choice of the concrete guarantees greater durability, low maintenance requirements both ordinary and post accident, with undoubtable advantages also in terms of accident risks linked to the presence of repair sites. To these advantages in terms of safety, we can add the lower costs of purchase and installation. Using concrete barriers, with the same amount of money, double the road kilometers are protected in respects to the use of steel barriers.
Finally a deciding factor in favor of concrete barriers is regarding their high environmental sustainability as fully recyclable, colorable and use of local materials.





 
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